/*
This is part of Screenbar, which is based in part on the Litestep
shell source code.

Copyright (C) 2008-2009 Jim Babcock
Copyright (C) 1997-2009 The LiteStep Development Team

This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
*/
#pragma once

class DragState
{
public:
	DragState();
	~DragState();
	
	void anchorDrag(ScreenbarWindow *sourceWindow, LayoutReference *anchor, Point offset);
	bool isAnchored() const;
	Point getAnchor() const;
	void beginDrag();
	void beginDrag(DragItem *dragged, ElementContext dragContext);
	bool isDragging() const;
	void cancelDrag();
	void updateHover();
	void drop();
	void drop(ScreenbarPanel *targetPanel, LayoutReference *target);
	bool isDropping() const;
	ElementContext getContext() const;
	ElementContext getDropContext() const;
	
private:
	enum State {
		notDragging = 0,
		anchored,
		dragging,
		dropping,
	};
	State state;
	
	LayoutReference *anchor;
	Point anchorOffset;
	Point anchorCursorPos;
	ElementContext dragContext;
	ElementContext dropContext;
	DragItem *draggedItem;
	
	DragWindow *window;
};

class DragWindow
	:public ScreenbarWindow
{
public:
	DragWindow(LayoutCacheNode *sourceNode, Point mouseOffset);
	~DragWindow();
	
	LRESULT handleEvent(UINT msg, WPARAM wParam, LPARAM lParam);
	void followCursor();
	
protected:
	string getElementName(LayoutCacheNode *sourceNode);
	
	Point mouseOffset;
	int width, height;
};

class DragItem
{
public:
	DragItem(LayoutReference *anchor);
	virtual ~DragItem();
	
	string getPrefix();
	
protected:
	string prefix;
};

extern DragState dragState;
